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  <title>[ #443362 ] null-pointer except. for doctype in
  pre</title>
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  <h1>Unofficial W3C Validator FAQ</h1>
  <p>This is a list of frequently asked questions and answers asked
  on the <a href=
  "http://lists.w3.org/Archive/Public/www-validator-css/"
     title="Mailing list archive">www-validator-css@w3.org mailing
     list</a>.</p>
  <h2>What does "<code>org.xml.sax.SAXException: Please, fix your
  system identifier (URI) in the DOCTYPE rule.</code>" mean?</h2>
  <p>Your XHTML document contains a document type declaration but
  the system identifier points at some non-W3C URI. Your document
  probably contains something like this:</p>
  <pre> 
 

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